I just got a General Instrument model DSR-920 4DTV receiver. It hasn't been used in years, but looks to be in very good condition. I've been reading the forum threads about this receiver and I understand there is an issue with the lithium battery failing and ruining the receiver. So I opened up the receiver and checked the battery voltage. It is still reading 6.3 volts which I believe means the unit is still good at present. But I don't want to take any chances. There is no telling how long before the battery fails. The receiver has been in storage for 5 years and still has the original battery. I just ordered a new battery today from Digi-Key, their number 439-1008-ND which is a Tadiran Batteries - TL-5955/P. I will be changing the battery as soon as the new one gets here. Wish me luck, and if anyone who has done this before wants to give me some encouragement, and pointers it would be very much appreciated.